Setting -ObjC to the linker flags in example project for iOS.

updates #22

Author: ap4y

Example/iOS/ORGMEngine Example.xcodeproj/project.pbxproj

@@ -385,6 +385,7 @@
 				GCC_PREFIX_HEADER = "ORGMEngine Example/ORGMEngine Example-Prefix.pch";
 				HEADER_SEARCH_PATHS = "../../OrigamiEngine/**";
 				INFOPLIST_FILE = "ORGMEngine Example/ORGMEngine Example-Info.plist";
+				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				WRAPPER_EXTENSION = app;
 			};
@@ -406,6 +407,7 @@
 				GCC_PREFIX_HEADER = "ORGMEngine Example/ORGMEngine Example-Prefix.pch";
 				HEADER_SEARCH_PATHS = "../../OrigamiEngine/**";
 				INFOPLIST_FILE = "ORGMEngine Example/ORGMEngine Example-Info.plist";
+				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				WRAPPER_EXTENSION = app;
 			};